FreeBSD/Linux Kernel Cross Reference
sys/dev/acpica/Osd/OsdSchedule.c

     /*-
      * Copyright (c) 2000 Michael Smith
      * Copyright (c) 2000 BSDi
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     */
    
    /*
     * 6.3 : Scheduling services
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include "opt_acpi.h"
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/bus.h>
    #include <sys/interrupt.h>
    #include <sys/kernel.h>
    #include <sys/kthread.h>
    #include <sys/malloc.h>
    #include <sys/proc.h>
    #include <sys/taskqueue.h>
    
    #include <contrib/dev/acpica/acpi.h>
    #include <dev/acpica/acpivar.h>
    
    #define _COMPONENT      ACPI_OS_SERVICES
    ACPI_MODULE_NAME("SCHEDULE")
    
    /*
     * Allow the user to tune the number of task threads we start.  It seems
     * some systems have problems with increased parallelism.
     */
    static int acpi_max_threads = ACPI_MAX_THREADS;
    TUNABLE_INT("debug.acpi.max_threads", &acpi_max_threads);
    
    MALLOC_DEFINE(M_ACPITASK, "acpitask", "ACPI deferred task");
    
    struct acpi_task_ctx {
        struct task                 at_task;
        ACPI_OSD_EXEC_CALLBACK      at_function;
        void                        *at_context;
    };
    
    TASKQUEUE_DEFINE(acpi, taskqueue_thread_enqueue, &taskqueue_acpi,
        taskqueue_start_threads(&taskqueue_acpi, acpi_max_threads, PWAIT,
        "acpi_task"));
    
    /*
     * Bounce through this wrapper function since ACPI-CA doesn't understand
     * the pending argument for its callbacks.
     */
    static void
    acpi_task_execute(void *context, int pending)
    {
        struct acpi_task_ctx *at;
    
        at = (struct acpi_task_ctx *)context;
        at->at_function(at->at_context);
        free(at, M_ACPITASK);
    }
    
    /*
     * This function may be called in interrupt context, i.e. when a GPE fires.
     * We allocate and queue a task for one of our taskqueue threads to process.
     */
    ACPI_STATUS
    AcpiOsExecute(ACPI_EXECUTE_TYPE Type, ACPI_OSD_EXEC_CALLBACK Function,
        void *Context)
    {
        struct acpi_task_ctx *at;
        int pri;
    
        ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
    
        if (Function == NULL)
            return_ACPI_STATUS (AE_BAD_PARAMETER);
   
       at = malloc(sizeof(*at), M_ACPITASK, M_NOWAIT);
       if (at == NULL)
           return_ACPI_STATUS (AE_NO_MEMORY);
   
       at->at_function = Function;
       at->at_context = Context;
       switch (Type) {
       case OSL_GPE_HANDLER:
       case OSL_NOTIFY_HANDLER:
           /*
            * Run GPEs and Notifies at the same priority.  This allows
            * Notifies that are generated by running a GPE's method (e.g., _L00)
            * to not be pre-empted by a later GPE that arrives during the
            * Notify handler execution.
            */
           pri = 10;
           break;
       case OSL_GLOBAL_LOCK_HANDLER:
       case OSL_EC_POLL_HANDLER:
       case OSL_EC_BURST_HANDLER:
           pri = 5;
           break;
       case OSL_DEBUGGER_THREAD:
           pri = 0;
           break;
       default:
           free(at, M_ACPITASK);
           return_ACPI_STATUS (AE_BAD_PARAMETER);
       }
   
       TASK_INIT(&at->at_task, pri, acpi_task_execute, at);
       taskqueue_enqueue(taskqueue_acpi, &at->at_task);
   
       return_ACPI_STATUS (AE_OK);
   }
   
   void
   AcpiOsSleep(ACPI_INTEGER Milliseconds)
   {
       int         timo;
   
       ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
   
       timo = Milliseconds * hz / 1000;
   
       /*
        * If requested sleep time is less than our hz resolution, use
        * DELAY instead for better granularity.
        */
       if (timo > 0)
           pause("acpislp", timo);
       else
           DELAY(Milliseconds * 1000);
   
       return_VOID;
   }
   
   /*
    * Return the current time in 100 nanosecond units
    */
   UINT64
   AcpiOsGetTimer(void)
   {
       struct bintime bt;
       UINT64 t;
   
       /* XXX During early boot there is no (decent) timer available yet. */
       if (cold)
           panic("acpi: timer op not yet supported during boot");
   
       binuptime(&bt);
       t = ((UINT64)10000000 * (uint32_t)(bt.frac >> 32)) >> 32;
       t += bt.sec * 10000000;
   
       return (t);
   }
   
   void
   AcpiOsStall(UINT32 Microseconds)
   {
       ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
   
       DELAY(Microseconds);
       return_VOID;
   }
   
   ACPI_THREAD_ID
   AcpiOsGetThreadId(void)
   {
       struct proc *p;
   
       /* XXX do not add ACPI_FUNCTION_TRACE here, results in recursive call. */
   
       p = curproc;
       KASSERT(p != NULL, ("%s: curproc is NULL!", __func__));
   
       /* Returning 0 is not allowed. */
       return (p->p_pid + 1);
   }

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